The fact that its a recurring revenue scheme allows them to get bonds based on that income. I think I saw that they were planning to secure $18B for a project when it was $15 for the toll.
Hochul won NY by a fairly narrow margin historically for the state against a pretty MAGA GOP guy. It's entirely possible some more normal blue state GOP type runs against her, wins and reduces the fee further.
It goes in the bond indenture. State can’t revoke the charge whose revenues it has already sold without defaulting.